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Quality of Life Research

Gepubliceerd in:

01-11-2008

Reliability across studies from the functional assessment of cancer therapy-general (FACT-G) and its subscales: a reliability generalization

Auteurs: David Victorson, Joshua Barocas, Juliette Song, David Cella

Gepubliceerd in: Quality of Life Research | Uitgave 9/2008

Abstract

Purpose

The aim of this study was to conduct a reliability generalization of the Functional Assessment of Cancer Therapy-General (FACT-G) and its subscales to examine variation in score reliability across all published studies.

Methods

We reviewed 344 publications based on predetermined criteria. About 78 published studies reported Cronbach’s Alpha reliability coefficients from their study in which data were collected. Sample size based weights were applied, and studies were coded on several scale and demographic characteristics. Using independent samples t tests, we examined associations between study characteristics and internal consistency variability.

Results

Average FACT-G score reliability was .88 (subscales ranged between .71–.83). Three variables produced small, statistically significant (P ≤ .05) eta squared effects (ranging between .06–.21) due to different sources of variation in the FACT-G and subscales: ethnicity, cancer type, and study type-all of which appeared to be related to disproportionate representation of studies with the majority including Caucasian samples, mixed cancer samples, and validation type studies.

Conclusions

The FACT-G and its subscales demonstrated acceptable reliability evidence across observed studies, without substantial variability due to scale or demographic characteristics.

vorige artikel Patient reported outcome measures: a model-based classification system for research and clinical practice

volgende artikel Evaluation of the American version of the 30-item Endometriosis Health Profile (EHP-30)

Cella, D. F., & Tulsky, D. S. (1993). Quality of life in cancer: Definition, purpose, and method of measurement. Cancer Investigation, 11, 327–336. doi:10.3109/07357909309024860.PubMedCrossRef

*Cella, D. F., Tulsky, D. S., Gray, G., Sarafian, B., Linn, E., Bonomi, A., et al. (1993). The functional assessment of cancer therapy scale: Development and validation of the general measure. Journal of Clinical Oncology, 11, 570–579.PubMed

Cella, D. (1997). Manual of the functional assessment of chronic illness therapy (FACIT scales). Evanston, IL: Center on Outcomes, Research and Education (CORE), Evanston Northwestern Healthcare and Northwestern University. Version 4.

Cella, D., Yost, K., Lai, J.-S., & Zagari, M. (2003). General US population norms for the functional assessment of cancer therapy-general (FACT-G). Quality of Life Research, 12, 852.

Charter, R. A., & Feldt, L. S. (2001). Meaning of reliability in terms of correct and incorrect clinical decisions: The art of decision making is still alive. Journal of Clinical and Experimental Neuropsychology, 23, 530–537. doi:10.1076/jcen.23.4.530.1227.PubMedCrossRef

Lindeboom, R., Sprangers, M. A., & Zwinderman, A. H. (2005). Responsiveness: A reinvention of the wheel? Health and Quality of Life Outcomes, 3, 8. doi:10.1186/1477-7525-3-8.PubMedCrossRef

Onwuegbuzie, A. J., & Daniel, L. G. (2002). A framework for reporting and interpreting internal consistency reliability estimates. Measurement & Evaluation in Counseling & Development, 35, 89–103.

Onwuegbuzie, A. J., Bailey, P., & Daley, C. E. (2002). The role of foreign language anxiety and students’ expectations in foreign language learning. Research in the Schools, 9, 33–50.

Nunnally, J. C., & Bernstein, I. H. (1994). Psychometric theory. New York: McGraw-Hill, Inc.

10.

Muchinsky, P. M. (1996). The correction for attenuation. Educational and Psychological Measurement, 56, 63–75. doi:10.1177/0013164496056001004.CrossRef

11.

Nunnally, J. C. (1978). Psychometric theory. New York: McGraw-Hill, Inc.

12.

Vacha-Haase, T. (1998). Reliability generalization: Exploring variance in measurement error affecting score reliability across studies. Educational and Psychological Measurement, 58, 6–20. doi:10.1177/0013164498058001002.CrossRef

13.

Schmidt, F. L., & Hunter, J. E. (1977). Development of a general solution to the problem of validity generation. The Journal of Applied Psychology, 62, 529–540. doi:10.1037/0021-9010.62.5.529.CrossRef

14.

Hunter, J. E., & Schmidt, F. L. (1990). Methods of meta-analysis. Newbury Park, CA: Sage.

15.

Cohen, J. (1973). Eta-squared and partial eta-squared in fixed factor anova designs. Journal of Educational and Psychological Measurement, 33, 107–112. doi:10.1177/001316447303300111.CrossRef

16.

Hayashino, Y., Noguchi, Y., & Fukui, T. (2005). Systematic evaluation and comparison of statistical tests for publication bias. Journal of Epidemiology, 15, 235–243. doi:10.2188/jea.15.235.PubMedCrossRef

17.

Andrykowski, M. A., Bishop, M., Hahn, E. A., Cella, D., Beaumont, J., Brady, M., et al. (2005). Long-term health-related quality of life, growth, and spiritual well-being after hematopoietic stem-cell transplantation. Journal of Clinical Oncology, 23, 599–608. doi:10.1200/JCO.2005.03.189.PubMedCrossRef

18.

Bacik, J., Mazumdar, M., Murphy, B. A., Fairclough, D., Eremenco, S., Mariani, T., et al. (2004). The functional assessment of cancer therapy-BRM (FACT-BRM): A new tool for the assessment of quality of life in patients treated with biologic response modifiers. Quality of Life Research, 13, 137–154. doi:10.1023/B:QURE.0000015297.91158.01.PubMedCrossRef

19.

Basen-Engquist, K., Bodurka-Bevers, D., Fitzgerald, M. A., Webster, K., Cella, D., Hu, S., et al. (2001). Reliability and validity of the functional assessment of cancer therapy-ovarian. Journal of Clinical Oncology, 19, 1809–1817.PubMed

20.

Brady, M. J., Cella, D. F., Mo, F., Bonomi, A. E., Tulsky, D. S., Lloyd, S. R., et al. (1997). Reliability and validity of the functional assessment of cancer therapy-breast quality-of-life instrument. Journal of Clinical Oncology, 15, 974–986.PubMed

21.

Calhoun, E. A., Welshman, E. E., Chang, C. H., Lurain, J. R., Fishman, D. A., Hunt, T. L., et al. (2003). Psychometric evaluation of the functional assessment of cancer therapy/gynecologic oncology group-neurotoxicity (Fact/GOG-Ntx) questionnaire for patients receiving systemic chemotherapy. International Journal of Gynecological Cancer, 13, 741–748. doi:10.1111/j.1525-1438.2003.13603.x.PubMedCrossRef

22.

*Cella, D., & Webster, K. (1997). Linking outcomes management to quality-of-life measurement. Oncology (Williston Park, N.Y.), 11, 232–235.

23.

*Cella, D., Eton, D. T., Lai, J.-S., Peterman, A. H., & Merkel, D. E. (2002). Combining anchor and distribution-based methods to derive minimal clinically important differences on the functional assessment of cancer therapy (fact) anemia and fatigue scales. Journal of Pain and Symptom Management, 24, 547–561. doi:10.1016/S0885-3924(02)00529-8.PubMedCrossRef

24.

Cella, D., Hahn, E. A., & Dineen, K. (2002). Meaningful change in cancer-specific quality of life scores: Differences between improvement and worsening. Quality of Life Research, 11, 207–221. doi:10.1023/A:1015276414526.PubMedCrossRef

25.

*Cella, D., Peterman, A., Hudgens, S., Webster, K., & Socinski, M. A. (2003). Measuring the side effects of taxane therapy in oncology: The functional assessment of cancer therapy-taxane (FACT-Taxane). Cancer, 98, 822–831. doi:10.1002/cncr.11578.PubMedCrossRef

26.

*Cella, D. F. (1995). The functional assessment of cancer therapy-lung cancer quality of life instrument. In R. J. Gralla & C. M. Moinpour (Eds.), Assessing quality of life in patients with lung cancer: A guide for clinicians (pp. 29–33). New York: NCM Publishers, Inc.

27.

*Cella, D., Zagari, M. J., Vandoros, C., Gagnon, D. D., Hurtz, H. J., & Nortier, J. W. (2003). Epoetin alfa treatment results in clinically significant improvements in quality of life in anemic cancer patients when referenced to the general population. Journal of Clinical Oncology, 21, 366–373. doi:10.1200/JCO.2003.02.136.PubMedCrossRef

28.

*Chang, V. T., Hwang, S. S., Feuerman, M., & Kasimis, B. S. (2000). Symptom and quality of life survey of medical oncology patients at a veterans affairs medical center: A role for symptom assessment. Cancer, 88, 1175–1183. doi:10.1002/(SICI)1097-0142(20000301)88:5<1175::AID-CNCR30>3.0.CO;2-N.

29.

*Conroy, T., Mercier, M., Bonneterre, J., Luporsi, E., Lefebvre, J. L., Lapeyre, M., et al. (2004). French version of FACT-G: Validation and comparison with other cancer-specific instruments. European Journal of Cancer, 40, 2243–2252. doi:10.1016/j.ejca.2004.06.010.PubMedCrossRef

30.

*Coster, S., Poole, K., & Fallowfield, L. J. (2001). The validation of a quality of life scale to assess the impact of arm morbidity in breast cancer patients post-operatively. Breast Cancer Research and Treatment, 68, 273–282. doi:10.1023/A:1012278023233.PubMedCrossRef

31.

*Costet, N., Lapierre, V., Benhamou, E., & Le Gales, C. (2005). Reliability and validity of the functional assessment of cancer therapy general (FACT-G) in French cancer patients. Quality of Life Research, 14, 1427–1432. doi:10.1007/s11136-004-5531-z.PubMedCrossRef

32.

*Courneya, K. S., & Friedenreich, C. M. (1997). Relationship between exercise pattern across the cancer experience and current quality of life in colorectal cancer survivors. Journal of Alternative and Complementary Medicine (New York, N.Y.), 3, 215–226. doi:10.1089/acm.1997.3.215.CrossRef

33.

*Dapueto, J. J., Francolino, C., Gotta, I., Levin, R., Alonso, I., Barrios, E., Afonzo, Y., & Cambiasso, S. (2001). Evaluation of the functional assessment of cancer therapy-general questionnaire (FACT-G) in a South American Spanish speaking population. Psycho-Oncology, 10, 88–92. doi:10.1002/1099-1611(200101/02)10:1<88::AID-PON483>3.0.CO;2-S.

34.

*Dapueto, J. J., Francolino, C., Servente, L., Chang, C. H., Gotta, I., Levin, R., et al. (2003). Evaluation of the functional assessment of cancer therapy-general (FACT-G) Spanish version 4 in South America: Classic psychometric and item response theory analyses. Health and Quality of Life Outcomes, 1, 32. doi:10.1186/1477-7525-1-32.PubMedCrossRef

35.

*Dapueto, J. J., Servente, L., Francolino, C., & Hahn, E. A. (2005). Determinants of quality of life in patients with cancer. Cancer, 103, 1072–1081. doi:10.1002/cncr.20870.PubMedCrossRef

36.

*Esper, P., Mo, F., Chodak, G., Sinner, M., Cella, D., & Pienta, K. J. (1997). Measuring quality of life in men with prostate cancer using the functional assessment of cancer therapy-prostate instrument. Urology, 50, 920–928. doi:10.1016/S0090-4295(97)00459-7.PubMedCrossRef

37.

*Eton, D. T., Cella, D., Yost, K. J., Yount, S. E., Peterman, A. H., Neuberg, D. S., et al. (2004). A combination of distribution—and anchor-based approaches determined minimally important differences (mids) for four endpoints in a breast cancer scale. Journal of Clinical Epidemiology, 57, 898–910. doi:10.1016/j.jclinepi.2004.01.012.PubMedCrossRef

38.

*Fallowfield, L. J., Leaity, S. K., Howell, A., Benson, S., & Cella, D. (1999). Assessment of quality of life in women undergoing hormonal therapy for breast cancer: Validation of an endocrine symptom subscale for the FACT- B. Breast Cancer Research and Treatment, 55, 189–199. doi:10.1023/A:1006263818115.PubMedCrossRef

39.

*Fumimoto, H., Kobayashi, K., Chang, C. H., Eremenco, S., Fujiki, Y., Uemura, S., et al. (2001). Cross-cultural validation of an international questionnaire, the general measure of the functional assessment of cancer therapy scale (FACT-G), for Japanese. Quality of Life Research, 10, 701–709. doi:10.1023/A:1013851216181.PubMedCrossRef

40.

*Heffernan, N., Cella, D., Webster, K., Odom, L., Martone, M., Passik, S., et al. (2002). Measuring health-related quality of life in patients with hepatobiliary cancers: The functional assessment of cancer therapy-hepatobiliary questionnaire. Journal of Clinical Oncology, 20, 2229–2239. doi:10.1200/JCO.2002.07.093.PubMedCrossRef

41.

*Holzner, B., Kemmler, G., Cella, D., De Paoli, C., Meraner, V., Kopp, M., et al. (2004). Normative data for functional assessment of cancer therapy—general scale and its use for the interpretation of quality of life scores in cancer survivors. Acta Oncologica (Stockholm, Sweden), 43, 153–160. doi:10.1080/02841860310023453.CrossRef

42.

*Holzner, B., Kemmler, G., Sperner-Unterweger, B., Kopp, M., Dunser, M., Margreiter, R., et al. (2001). Quality of life measurement in oncology—a matter of the assessment instrument? European Journal of Cancer, 37, 2349–2356. doi:10.1016/S0959-8049(01)00307-0.PubMedCrossRef

43.

*Hunt, T., Beaumont, J., Webster, K., Cella, D., & Elting, L. (2003). Development and validation of a brief self-report questionnaire specific to thrombocytopenia: The functional assessment of cancer therapy-thrombocytopenia (FACT-Th). Quality of Life Research, 12, 735.

44.

*Hwang, S. S., Chang, V. T., Cogswell, J., & Kasimis, B. S. (2002). Clinical relevance of fatigue levels in cancer patients at a veterans administration medical center. Cancer, 94, 2481–2489. doi:10.1002/cncr.10507.PubMedCrossRef

45.

*Kemmler, G., Holzner, B., Kopp, M., Dunser, M., Margreiter, R., Greil, R., et al. (1999). Comparison of two quality-of-life instruments for cancer patients: The functional assessment of cancer therapy-general and the european organization for research and treatment of cancer quality of life questionnaire-C30. Journal of Clinical Oncology, 17, 2932–2940.PubMed

46.

*Knight, S. J., Chmiel, J. S., Sharp, L. K., Kuzel, T., Nadler, R. B., Fine, R., et al. (2001). Spouse ratings of quality of life in patients with metastatic prostate cancer of lower socioeconomic status: An assessment of feasibility, reliability, and validity. Urology, 57, 275–280. doi:10.1016/S0090-4295(00)00934-1.PubMedCrossRef

47.

*Lau, A. K., Chang, C. H., Tai, J. W., Eremenco, S., Liang, R., Lie, A. K., et al. (2002). Translation and validation of the functional assessment of cancer therapy-bone marrow transplant (FACT-BMT) version 4 quality of life instrument into traditional Chinese. Bone Marrow Transplantation, 29, 41–49. doi:10.1038/sj.bmt.1703313.PubMedCrossRef

48.

*Lee, E. H., Chun, M., Kang, S., & Lee, H. J. (2004). Validation of the functional assessment of cancer therapy-general (FACT-G) scale for measuring the health-related quality of life in Korean women with breast cancer. Japanese Journal of Clinical Oncology, 34, 393–399. doi:10.1093/jjco/hyh070.PubMedCrossRef

49.

*Lee, E., Paul, D., & Owen, S. (1999). Age, self-efficacy, and change in patients’ adjustment to cancer. Cancer Practice, 7, 170–176. doi:10.1046/j.1523-5394.1999.74004.x.CrossRef

50.

*List, M. A., D’Antonio, L. L., Cella, D. F., Siston, A., Mumby, P., Haraf, D., et al. (1996). The performance status scale for head and neck cancer patients and the functional assessment of cancer therapy-head and neck scale. A study of utility and validity. Cancer, 77, 2294–2301. doi:10.1002/(SICI)1097-0142(19960601)77:11<2294::AID-CNCR17>3.0.CO;2-S.

51.

*Matsuda, T., Aptel, I., Exbrayat, C., & Grosclaude, P. (2003). Determinants of quality of life of bladder cancer survivors five years after treatment in France. International Journal of Urology, 10, 423–429. doi:10.1046/j.1442-2042.2003.00657.x.PubMedCrossRef

52.

*McQuellon, R. P., Russell, G. B., Cella, D. F., Craven, B. L., Brady, M., Bonomi, A., et al. (1997). Quality of life measurement in bone marrow transplantation: Development of the functional assessment of cancer therapy-bone marrow transplant (FACT-BMT) scale. Bone Marrow Transplantation, 19, 357–368. doi:10.1038/sj.bmt.1700672.PubMedCrossRef

53.

*Mullin, V., Cella, D., Chang, C. H., Eremenco, S., Mertz, M., Lent, L., et al. (2000). Development of three African language translations of the FACT-G. Quality of Life Research, 9, 139–149. doi:10.1023/A:1008903304950.PubMedCrossRef

54.

*Noguchi, W., Ohno, T., Morita, S., Aihara, O., Tsujii, H., Shimozuma, K., et al. (2004). Reliability and validity of the functional assessment of chronic illness therapy-spiritual (FACIT-Sp) for Japanese patients with cancer. Supportive Care in Cancer, 12, 240–245. doi:10.1007/s00520-003-0582-1.PubMedCrossRef

55.

*Overcash, J., Extermann, M., Parr, J., Perry, J., & Balducci, L. (2001). Validity and reliability of the FACT-G scale for use in the older person with cancer. American Journal of Clinical Oncology, 24, 591–596. doi:10.1097/00000421-200112000-00013.PubMedCrossRef

56.

*Pandey, M., Thomas, B. C., Ramdas, K., Eremenco, S., & Nair, M. K. (2002). Quality of life in breast cancer patients: Validation of a FACT-B Malayalam version. Quality of Life Research, 11, 87–90. doi:10.1023/A:1015083713014.PubMedCrossRef

57.

*Pandey, M., Thomas, B. C., Ramdas, K., Eremenco, S., & Nair, M. K. (2004). Reliability and validity of the malayalam functional assessment of cancer therapy for head and neck cancer. The Indian Journal of Medical Research, 120, 51–55.PubMed

58.

*Ratanatharathorn, V., Sirilerttrakul, S., Jirajarus, M., Silpakit, C., Maneechavakajorn, J., Sailamai, P., et al. (2001). Quality of life, functional assessment of cancer therapy-general. Journal of the Medical Association of Thailand, 84, 1430–1442.PubMed

59.

*Rhee, J. S., Loberiza, F. R., Matthews, B. A., Neuburg, M., Smith, T. L., & Burzynski, M. (2003). Quality of life assessment in nonmelanoma cervicofacial skin cancer. The Laryngoscope, 113, 215–220. doi:10.1097/00005537-200302000-00004.PubMedCrossRef

60.

*Ribaudo, J. M., Cella, D., Hahn, E. A., Lloyd, S. R., Tchekmedyian, N. S., Von Roenn, J., et al. (2000). Re-validation and shortening of the functional assessment of anorexia/cachexia therapy (FAACT) questionnaire. Quality of Life Research, 9, 1137–1146. doi:10.1023/A:1016670403148.PubMedCrossRef

61.

*Rose, P., & Yates, P. (2001). Quality of life experienced by patients receiving radiation treatment for cancers of the head and neck. Cancer Nursing, 24, 255–263. doi:10.1097/00002820-200108000-00002.PubMedCrossRef

62.

*Sharp, L. K., Knight, S. J., Nadler, R., Albers, M., Moran, E., Kuzel, T., et al. (1999). Quality of life in low-income patients with metastatic prostate cancer: Divergent and convergent validity of three instruments. Quality of Life Research, 8(5), 461–470. doi:10.1023/A:1008940015696.PubMedCrossRef

63.

*Steel, J. L., Geller, D. A., & Carr, B. I. (2005). Proxy ratings of health related quality of life in patients with hepatocellular carcinoma. Quality of Life Research, 14, 1025–1033. doi:10.1007/s11136-004-3267-4.PubMedCrossRef

64.

*Street, R. L., Jr, & Voigt, B. (1997). Patient participation in deciding breast cancer treatment and subsequent quality of life. Medical Decision Making, 17, 298–306. doi:10.1177/0272989X9701700306.PubMedCrossRef

65.

*Thomas, B. C., Pandey, M., Ramdas, K., Sebastian, P., & Nair, M. K. (2004). FACT-G: Reliability and validity of the malayalam translation. Quality of Life Research, 13, 263–269. doi:10.1023/B:QURE.0000015303.68562.3f.PubMedCrossRef

66.

*Wan, G. J., Counte, M. A., Cella, D. F., Hernandez, L., McGuire, D. B., Deasay, S., et al. (1999). The impact of socio-cultural and clinical factors on health-related quality of life reports among hispanic and African–American cancer patients. Journal of Outcome Measurement, 3, 200–215.PubMed

67.

*Ward, W. L., Hahn, E. A., Mo, F., Hernandez, L., Tulsky, D. S., & Cella, D. (1999). Reliability and validity of the functional assessment of cancer therapy-colorectal (FACT-C) quality of life instrument. Quality of Life Research, 8, 181–195. doi:10.1023/A:1008821826499.PubMedCrossRef

68.

*Weitzner, M. A., Meyers, C. A., Gelke, C. K., Byrne, K. S., Cella, D. F., & Levin, V. A. (1995). The functional assessment of cancer therapy (FACT) scale. development of a brain subscale and revalidation of the general version (FACT-G) in patients with primary brain tumors. Cancer, 75, 1151–1161. doi:10.1002/1097-0142(19950301)75:5<1151::AID-CNCR23>3.0.CO;2-Q.

69.

*Webster, K., Odom, L., Peterman, A. H., Lent, L., & Cella, D. (1999). The functional assessment of chronic illness therapy (FACIT) measurement system: Validation of version 4 the core questionnaire. Quality of Life Research, 8(7), 604.

70.

*Winstead-Fry, P., & Schultz, A. (1997). Psychometric analysis of the functional assessment of cancer therapy-general (FACT-G) scale in a rural sample. Cancer, 79, 2446–2452. doi:10.1002/(SICI)1097-0142(19970615)79:12<2446::AID-CNCR23>3.0.CO;2-Q.

71.

*Yellen, S. B., Cella, D. F., Webster, K., Blendowski, C., & Kaplan, E. (1997). Measuring fatigue and other anemia-related symptoms with the functional assessment of cancer therapy (FACT) measurement system. Journal of Pain and Symptom Management, 13, 63–74. doi:10.1016/S0885-3924(96)00274-6.PubMedCrossRef

72.

*Yoo, H. J., Ahn, S. H., Eremenco, S., Kim, H., Kim, W. K., Kim, S. B., et al. (2005). Korean translation and validation of the functional assessment of cancer therapy-breast (FACT-B) scale version 4. Quality of Life Research, 14, 1627–1632. doi:10.1007/s11136-004-7712-1.PubMedCrossRef

73.

*Yoo, H. J., Kim, J. C., Eremenco, S., & Han, O. S. (2005). Quality of life in colorectal cancer patients with colectomy and the validation of the functional assessment of cancer therapy-colorectal (FACT-C), version 4. Journal of Pain and Symptom Management, 30, 24–32. doi:10.1016/j.jpainsymman.2004.12.009.PubMedCrossRef

74.

*Yost, K. J., Sorensen, M. V., Hahn, E. A., Glendenning, G. A., Gnanasakthy, A., & Cella, D. (2005). Using multiple anchor- and distribution-based estimates to evaluate clinically meaningful change on the functional assessment of cancer therapy-biologic response modifiers (FACT-BRM) instrument. Value in Health, 8, 117–127. doi:10.1111/j.1524-4733.2005.08202.x.PubMedCrossRef

75.

*Yu, C. L., Fielding, R., Chan, C. L., Tse, V. K., Choi, P. H., Lau, W. H., et al. (2000). Measuring quality of life of Chinese cancer patients: A validation of the Chinese version of the functional assessment of cancer therapy-general (FACT-G) scale. Cancer, 88, 1715–1727. doi:10.1002/(SICI)1097-0142(20000401)88:7<1715::AID-CNCR28>3.0.CO;2-K.

76.

Wilkinson, L., & American Psychological Association Task Force on Statistical Inference. (1999). Statistical methods in psychology journals: Guidelines and explanations. The American Psychologist, 54, 594–604. doi:10.1037/0003-066X.54.8.594.CrossRef

Titel: Reliability across studies from the functional assessment of cancer therapy-general (FACT-G) and its subscales: a reliability generalization
Auteurs: David Victorson
Joshua Barocas
Juliette Song
David Cella
Publicatiedatum: 01-11-2008
Uitgeverij: Springer Netherlands
Gepubliceerd in: Quality of Life Research / Uitgave 9/2008
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI: https://doi.org/10.1007/s11136-008-9398-2

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